We have over 180 ATA's deployed at a current client and we have been doing fine having it set to auto. Remember, no matter which way you go with your speed/duplex settings it is crucial to have the port on the switch and the device match. Auto on both sides or hard coded on both sides. The ATA186 defaults to Auto, I am guessing that you are experiencing collisions because you are hard coded to 100 full on the switch side.
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